They were downloadable via Heidoc's Windows and Office downloader tool > https://www.heidoc.net/joomla/technology-science/microsoft/67-microsoft-windows-and-office-iso-download-tool

However, since April of 2023, these downloads have been taken down. Luckily, I saved the Ultimate ISO. Since these are not OEM ISOs, you would almost always want the Ultimate Edition anyway, however, you can copy/paste the link for another one you want from Heidoc, and paste it into web.archive.org, to get a VERY slow download of another edition.

Since I and many other people still use Windows 7 for various reasons, I am uploading this ISO here. It is untouched, with the original SHA256SUM.txt. It has not been tampered with. If you don't believe me, use the above method to download it from web.archive.org, and compare the hashes. I don't normally like downloading OSes anywhere besides the official location, but Microsoft has left us no choice, so I am taking initiative and putting it here. I will be placing a link to this also on my site > https://thorium.rocks/win7 The link that used to point to the official Microsoft one was here > https://download.microsoft.com/download/5/1/9/5195A765-3A41-4A72-87D8-200D897CBE21/7601.24214.180801-1700.win7sp1_ldr_escrow_CLIENT_ULTIMATE_x64FRE_en-us.iso